A belt and a wallet cost $ 42. Seven belts and 4 wallets cost $ 213. Find the cost of each item.

How to do this , and can some one explain

In angle pqr find the measure of

For the quadratic function [tex]y=(x+4)^2-1[/tex] , do the following: a) rewrite the function in the standard form, b) rewrite the function in intercept form, c) find the vertex, d) find the y-intercept, e) find the x-intercepts.